Specific amount. You can measure the amount. How exactly that's done will vary depending upon the markup and how the slideshow loads visa vis how its height is set. But let's say your nav bar is in a division with an id of nav, you could do:
Code:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
<script type="text/javascript">
jQuery(function($){
$(window).scrollTop($('#nav').offset().top);
});
</script>
This could fail if the slideshow waits until some or all of its images are loaded before setting its own height dimension. On the site you linked to, it appears the height of the slideshow is set in css and/or a configuration that takes effect before or on DOM load. So you would put this code after the code that initializes the slideshow, except if the slideshow's height is set for sure and accurately and finally in css, then it would be best to run this code first.
Also, if you're using jQuery on the page already, you should only need one external tag to the jQuery script. It should come before all other scripts that use jQuery.
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